Implements push notifications for LLS via MSC4505 (#5872)

* Render live location share start push notifications in the NSE

Live location sharing starts with a cleartext org.matrix.msc3672.beacon_info
STATE event, which the NSE previously rendered as the generic fallback
notification because NotificationContentBuilder only handled message-like
event content.

- Handle .state(.beaconInfo) in NotificationContentBuilder: sender display
  name as the title (same as other messages) with a new localized body,
  "Started sharing their live location".
- Let beaconInfo state events through NotificationHandler's preprocessing
  (all other state events are still discarded).
- Add notification_live_location_started_body, imported from Localazy.
- Unit tests for the new state-event notification paths.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* rename processMessageLike in processAsMessage

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Mauro Romito <mauro.romito@element.io>

NSE/Sources/NotificationHandler.swift

@@ -148,8 +148,13 @@ nonisolated class NotificationHandler {
                  .beacon:
                 return .unsupportedShouldDiscard
             }
-        case .state:
-            return .unsupportedShouldDiscard
+        case .state(let stateContent):
+            switch stateContent {
+            case .beaconInfo:
+                return .shouldDisplay
+            default:
+                return .unsupportedShouldDiscard
+            }
         case .none:
             return .unsupportedShouldDiscard
         }